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Built a scalable real-time chat PWA for CA professionals using React.js, Node.js, Express.js, Socket.IO, and MongoDB, with features like multi-workspace support, bulk document upload, and multi-channel notifications (email, push, in-app) via Redis, reducing missed messages by 80% and API latency by 600 ms.
Engineered a no-code website builder backend with React.js and Node.js, enabling non-technical users to launch fully functional, theme-based websites.
Led frontend and backend feature development across modules in the Practice Management System (PMS), streamlining workflows and increasing overall user satisfaction and retention.

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Enhanced an Uber-like ride app by redesigning the UI (boosting engagement by 60%), optimizing the codebase for readability and best practices, migrating to AndroidX for improved compatibility, and transitioning the architecture from MVC to MVVM to enhance modularity and simplify development.

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Developed 10+ high-quality, scalable Android apps across diverse domains (dating, music, eCommerce, job portals, marketplaces, trading), integrating custom push notifications to enhance user engagement, showcasing advanced mobile development skills.

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Replaced the existing signaling client with Socket.IO to improve response time by 20%, added Epoxy to significantly reduce load times and decrease boilerplate code by 20–30% on RecyclerViews, and extensively refactored code to adhere to MVVM Clean architecture.

Designed a video transcoding solution that efficiently converts videos from 144p to 1080p by leveraging AWS S3 for storage, EventBridge for event listening, and AWS SQS for job queuing; implemented scalable video processing using FFMPEG on ECS Fargate, utilized AWS Lambda, and built the entire infrastructure using IAC Tool to ensure robustness, scalability, and high performance.

Developed a full-stack Habit Builder App using Kotlin and Jetpack for the Android frontend, and Node.js, Express.js, and MongoDB for the backend, empowering users to cultivate healthy habits through personalized challenges, real-time chat, and seamless data management.

Vikas